Efficient small-molecule organic solar cells incorporating a doped buffer layer
| Autor: | Dei-Wei Chou, Kan-Lin Chen, Teen-Hang Meen, Wen-Ray Chen, Yao-Jen Tsao, Chien-Jung Huang |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Fullerene Organic solar cell Doping Inorganic chemistry Energy conversion efficiency Metals and Alloys Surfaces and Interfaces Cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials Indium tin oxide law.invention Chemical engineering law Materials Chemistry Layer (electronics) Current density |
| Zdroj: | Thin Solid Films. 536:235-239 |
| ISSN: | 0040-6090 |
| Popis: | Small-molecule organic solar cells (OSCs) with an optimized structure of indium tin oxide/poly (3,4-ethylenedioxythioxythiophene):poly(styrenesulfonate)/copper phthalocyanine (CuPc) (10 nm)/CuPc: fullerene (C60) mixed (20 nm)/C60 (20 nm)/4,7-diphenyl-1,10-phenanthroline (BPhen) (5 nm)/Ag were fabricated. In this study, the cesium carbonate-doped BPhen (Cs2CO3:BPhen) was adopted as the buffer layer to enhance the efficiency of the OSCs. The photovoltaic parameters of the OSCs, such as the short-circuit current density and fill factor, depend on the doping concentration of Cs2CO3 in the BPhen layer. The cell with a Cs2CO3:BPhen (1:4) cathode buffer layer exhibits a power conversion efficiency (PCE) of 3.51%, compared to 3.37% for the device with the pristine BPhen layer. The enhancement of PCE was attributed to the energy-level alignment between the C60 layer and the Cs2CO3:BPhen layer. In addition, the characterization measured using atomic force microscopy shows that the Cs2CO3:BPhen layers have smoother surfaces. |
| Databáze: | OpenAIRE |
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